Method of fabricating paper containers



A. MOORE.

METHOD OF FABRICATING PAPER CONTAINERS.

APPLICATION FILED SEPT.9, 1920.

Patented Apr. 25, 1922.

0 M04 FE ATTORNEYS UNlTED;

s PATENT oF c E.

ARLINGTON MOORE, OF BOSTON, MASSACHUSETTS, ASSIGN'OIR. TO CLARKE-MOORE CORPORATION, OF WILMINGTON,

To all whom it may concern.

Be it known that I, ARLINGTON MOORE, a

citizen of the United States, residing at Bos,

ton, in the county of Suffolk, State of Massachusetts," have invented certain new and use-' ful Improvements in Methods of Fabricating Paper Containers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which itTappertains to make and us the same.

The present invention relates to methods DELAWARE, A CORPORATION or DELAWARE, METHOD or raemcarme PAPER. CONTAINERS.

Specification of-Letters Patent. P t 25 v1922 v Q o Application filed September 9, 1920. Serial Ifl'o. 409,166.

, proximately. the same amount to produce a of fabricating containers from any suitable fibrous stockwhether paper or resembling paper, and particularly for forming parts thereof, more especially the neck and tions of the closure, with a plurality of folds of stock. The paper stock may be single or multiple ply. with or without incorporating a binder, and the container-may be in the form of a firkin, or haveean'y suitable polygonal or curved form. Y

In the construction of paper containers, I have found it desirably to form such parts of the container asthe neck and portions of the closure of a plurality of folds of stock.

Such folds provide, not only an increased thickness of stock to work in the formation of theparts and upon which toconstruct the closure, but also t0.reenf0rce the container and closure against external and internal pressures. Irrespective of the form of the container or closures therefor, orof the means employed whether manual or mechanical, the plurality of folds of stock are formed according to the method of the present invention, preferably from a con- "tinuation of the side wall, by doubling back and then reversely folding the terminal por-.

tion of the stock or the side wall. 'lVhere the folded part is to consist of three folds .of stock, for example, in the ledge to support the cap of the container, the doubledback and reversely-extended portions of the side wall are each folded in'adjusted amount depending upon the size of the ledge, or

upon the amount the ledge isto'extend into the container to compensate for changes in' gage dimensions due to manufacturing inaccuracies and expansion and contraction of the blanks beforeforming. And, where the folded part consists of three folds to form, for example, the neck of the container, the

doubled-back and reversely-extended portions of the side wall are each folded in apneck tr iply enforced throughout. In this con-. struction the side wall is preferably doubled back inwardly to form a hem and the terlmnal POI'tlOIl' thereof is extended in reye rsely. folded position within the hem and in contact with the folded edge thereof.

. Whether'or not the folded part consists -'mechanical means is employed to form the folds, either such means or the stock may be rotated in forming the folds. Irrespec' tive, however, of whether the stock is rotated-but preferably so, thefolds may be- Sub ected to a high pressure suflicie-nt to bring the meeting surfaces of the stock in intimate contact" or in consolidation, thus gage dimensions,

producing a highly compressed and practically solldified mass rigidly set to permanent gage dimensions.

Whether or not .the stock 'isrotated in forming the folds, or the folds subjected to a high pressure to fix them to permanent the invention further comprehends as another of its parts the metho" of forming a portion of the container with a plurality -.-of folds vof stock, which consists of folds of in doubling back andlreversely folding the terminal portion thereof and then molding the folds. The stock-may be rotated. in

' forming the folds which may then be molded, preferably under a high pressure. In the method specifically described hereinafter, the operation consists in successively rotating the .container,- doublin back and reversely folding the side wall t ereof, and

then molding the folds thereof under a high pressure.' p The accompanying drawings illustrate the preferred method of forming the folds of stock, that is by mechanical means, the mechanism shown being, however, merely illustrative of the 'steps comprising the method and the mechanical movements involved therein.

Fig. 1 is an elevation, partly in section, of the mechanism illustrative of the method of forming the folds; Fig. 2 is a'plan view along the line 22 of Fig. 1; Fig. 3 is a secbulge to provide a cap-retaining Figs. 8 and 9 are Fi 3; Fig. 5 is a section along the line 5-5 of ig. 3; Figs. 6 and 7 are detail plan and side views respectively of the tools for forming the folds prior to the advancement of the tool-for reversely folding the stock; similar views showing the position of the tools after the completion of the formation of the folds; Figs. 10 and 11 are similar views showing the tools in position to be withdrawn; Fig. 12 is a sectional detail of the upper part of a finished container in which the folded portion forms outward groove; and Fig. 13 is a similar view showing three folds of stock formed into a ledge to support the cap of the container.

The mechanism comprises a-rotating die 1 having a conical shaped bore 2 and a molding surface 3' at its outer end. The die 1 is set in a gear 4 which is mounted on ball bearings 5 to rotate within a housing 6. The geanis driven by a pinion 7 keyed to a triple-enforced neck having an of thedie by means of a plug 9 is the paper stock 10 from which the container is formed. Theplug 9 is mounted on a shaft 11 and 'turns on" ball bearings 12, the shaft 11 being adjustably secured at 13 in a hub 14.

The folds of stock are, formed by means of a tool 15 for doubling back the stock. and

a hook-shaped tool .16 for reversely folding the stock. The tool 15 consists of a rod.

having axbent portion 15, with a bore 19 therethrou h, which forms a curved surface 18, a similarly bent and extended port-ion 20, and a shank 17. The hook-shaped tool 16is secured at the end of the shaft 21 which extends through the (bore 19. Both tools are positioned at one side of the axis of the die as illustrated iii Figs. 2 and 3. Supporting the tool 15 is a frame 22 having a bearing 23 in whichthe extended portion 20 of the tool is fastened and a bearing 24 in which is adj ustably secured, as at, 25, one end of a rack shaft 26, the other end of which is mounted-to reciprocate in a bearing 27.

Meshing with the rack shaft 26 is a toothed segment '28 keyed to a shaft 29 which is connected to driving means cont-rolled by cams (neither being shown) for imparting to the segment an intermittentrotary motion which in turn intermittently reciprocates the rack shaft 26, the frame 22. and

' the tool 15 mounted therein; The frame 22 has a bearing 30 supporting a portion 31 of the shaft 21, the diameter of which is slightly greater than the shaft to provide a shoulder 32-. The interior of the bearing 30 has a spiral cam groove 33 in which'fits a pin 34 projecting from the portion 31 of the shaft 21. Extending beyond the shoulder 32 is a portion 35 f the shaft 21 which is secured in a rack bushing 36 between the shoulder 32'and a collar 37 pinned at 38 to the end of the shaft. Meshing with the rack bushing is a pinion 39 keyed to a shaft 40 which is connected by driving means controlled by cams (neither being' shown) for producing an intermittent rotary motion to reciprocate the tool 16 and move it relatively to the tool 15.

In the method illustrated, the top portion of the container is formed with a plurality of folds, the operation being as follows: Prior to the advancement of either of the tools against the stock, the die is rotated at about 500 revolutions per minute by means ofthe shaft 8 through the pinion 7, and the terminal portion ofthe stock projects beyond the face of the die. The tool 15 is then advanced against the stock and in virtue of its position at one side of the axis of the die, 41, first by the shank 17 of the tool 15 and turned over as shown at 42 in Fig. 4. Upon further rotation of the stock, the curved sur-' face18 of the tool 15 tangentially engages the turned over edge thereof, as at 43, Figs.

3 and 5,, and doubles thestock backwardly,

stock in the reverse direction, being drawn backwardly from the position shown in F igs. 6 and 7 to the operative position in Figs. 8 and 9, while the hooked portion 45 is turned at an angle to the tool 15 and toward the stock. The hooked ortion 45 engages the edge of the stock and reversely folds it, as at 46. thus completing the folding operation. The tool 16 is now extended forwardly and the hooked portion turned away from the folds into the position shown in Figs. 10 and 11 to clear the work when both tools are withdrawn. i T

It is evident that by adjusting the movement of each of the tools 15 and 16 against the stock, the amounts which the doubled back portion 44, and reversely extended pore tion46, are folded may be varied to produce. for example, portions folded approxithe edge of the stock is engaged, as at ously the tool 16 is advanced against the mately in the same amount, or in varying 47] and an' outwardly bulging .part 48 to form a cap-retainmg groove 49, as illustrated. in Fig. 12, or three folds of stock to form a ledge 50, as illustrated in Fig. 13. Furthermore, the folds so molded may be subjected to a high pressure ofabout four to six thousand pounds per square inch to 13 render them highly compressed and praca tically solidified and to set them to permanent gage dimensions.

Having thus described my invention, what I claim is: 1

1. In the fabrication of paper containers,

the herein described method of forming a versely folding the terminal portion thereof.

3. In the fabrication of paper containers,

the herein described method of forming a portion of the container with a plurality of folds of stock, which consists in' doubling back and then reversely folding the terminal portion of the stock by mechanical means while either the latter or the stock is rotated.

4'. In the fabrication of paper containers, the herein described method of forming a portion of the container with a plurality of folds of stock, which consists in doubling back and reversely folding the terminal portion of the stock and then subjecting the folds to a high ressure.

5. In the fabrlcation of paper containers,

the herein described method of forming a portion of the container with a plurality of folds of stock, which consists in rotating the stock, doubling back and reversely folding theterminal portion thereof, and then subjecting the folds to a high pressure.

6. In the fabrication of paper containers, the herein described method of forming a portion of the container with a plurality of folds of stock which consists in doubling back and reversely folding the terminal portion thereof, and then molding the folds,

7. In the fabrication of paper containers, the herein described method of forming a portion of the container with a plurality of folds of stock, Which consists in rotating the stock, doubling back and reversely folding the terminal portion thereof, and then molding the folds.

8. In the fabrication of paper containers, the herein described method of formin a portion of the container with a plura ity of folds of stock, which consists in rotating the stock, doubling back and reversely folding the terminal portion thereof, and then molding the folds under a high pressure.

9. In the fabrication of paper containers, the herein described method of forming a portion of the container with a plurality of folds of stock, which consists in successively rotating the container, doubling back and reversely folding the terminal portion of the side wall thereof, and then molding the folds under a high pressure.

In testimony whereof I afiix m signature.

ARLINGTQN KIOORE. 

